Vaccines for bovine respiratory disease are more effective when administered via nasal spray than injection, according to a University of Saskatchewan study.
Dr. Philip Griebel’s study found vaccines administered at branding (age three to six weeks) and at weaning (age six to seven months) were more effective when given via nasal spray.
“Intranasal vaccination at branding led to persisting immunity until calves were six to seven months old. A second intranasal vaccination at weaning resulted in complete protection against BRD. Meanwhile, the intramuscular vaccination at weaning did not prevent the disease,” said Griebel.